Fatigue Life Estimation And Topology Optimization Of The Machine Tool Slider

The mechanical structure will produce vibration in the process of running.The vibration of the mechanical structure will make the structure have fatigue damage.Fatigue damage is the main reason of structural failure.Studying the fatigue of mechanical structure has important significance for the maintenance of the mechanical structure normal operation and improving the reliability of the mechanical system.The most important problem of studying mechanical vibration fatigue of the structure is that the fatigue life of construction machinery parts can be estimated.If the fatigue life of mechanical structures can be estimated,structures will be repaired before occurring fatigue damage.Then it will be able to avoid a lot of mechanical damage caused by structural fatigue problems.The main content of this paper is to estimate the fatigue life of slider of the milling machine special for processing elevator panel plane under random vibration loads,and operate its topology optimization.Firstly,finite element static analysis and modal analysis is carried out on the slider by using ANSYS Workbench,the equivalent stress distribution,displacement distribution results and modal parameters of slider are obtained,ie slider natural frequencies and mode shapes,through the analysis of the results to understand the static and dynamics mechanical performance of slider,and provides the basis for random vibration analysis and topology optimization.Secondly,the random vibration analysis is carried out on the slider which is based on the result of modal analysis.During the random vibration analysis,the power spectral density load is needed to be applied to the slider.The fatigue life of slider under random vibration loads is estimated according to the results of the random vibration analysis combined with Steinberg's three interval law.By slider random vibration response test,the measured response of the test results and the random vibration simulation results are basically the same,which proves the validity of the simulation results.Finally,the topology optimization is carried out on the slider in the final section of this paper which is based on the result of static analysis and modal analysis.Finite element static analysis,modal analysis and random vibration analysis are carried out on the result of topology optimization.The analysis results shows that the overallperformance of slider has been improved,which indicates that the topology optimization results is valid.